vec3 a_position      : POSITION;
vec2 a_texcoord0     : TEXCOORD0;
vec3 horizioncolor   : COLOR1;
vec3 cloudscolor     : COLOR2; 
vec4 v_color         : COLOR0;
vec2 v_texcoord0     : TEXCOORD0;
vec4 worldpos        : TEXCOORD1;
float alfadata       : DATA0
